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    Elastic capsule deformation in general irrotational linear flows

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    nihms417893.pdf (1.612Mb)
    Links to Files
    https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3575197/
    Permanent Link
    10.1088/0169-5983/44/5/055503
    http://hdl.handle.net/11603/11628
    Collections
    • UMBC Faculty Collection
    • UMBC Mechanical Engineering Department
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    Author/Creator
    Szatmary, Alex C.
    Eggleton, Charles D.
    Date
    2012-07-05
    Type of Work
    27 pages
    Text
    journal article pre-print
    Citation of Original Publication
    Alex C Szatmary , Charles D Eggleton , Elastic capsule deformation in general irrotational linear flows, Fluid Dynamics Research, Volume 44, Number 5 ,2012, doi: 10.1088/0169-5983/44/5/055503
    Rights
    This item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
    Subjects
    Elastic capsule
    deformation
    linear flows
    uniaxial
    biaxial
    planar extensional flows
    UMBC High Performance Computing Facility (HPCF)
    Abstract
    Knowledge of the response of elastic capsules to an imposed fluid flow is necessary for predicting the deformation and motion of biological cells and synthetic capsules in microfluidic devices and in microcirculation. Capsules have been studied in shear, planar extensional and axisymmetric extensional flows. Here, the flow gradient matrix of a general irrotational linear flow is characterized by two parameters, its strain rate, defined as the maximum of the principal strain rates, and a new term, q, the difference of the two lesser principal strain rates, scaled by the maximum principal strain rate; this characterization is valid for ellipsoids in irrotational linear flow, and gives good results for spheres in general linear flows at low capillary numbers. We demonstrate that deformable non-spherical particles align with the principal axes of an imposed irrotational flow. Thus, it is most practical to model deformation of non-spherical particles already aligned with the flow, rather than considering each arbitrary orientation. Capsule deformation was modeled for a sphere, a prolate spheroid and an oblate spheroid, subjected to combinations of uniaxial, biaxial and planar extensional flows; modeling was performed using the immersed boundary method. The time response of each capsule to each flow was found, as were the steady-state deformation factor, mean strain energy and surface area. For a given capillary number, planar flows led to more deformation than uniaxial or biaxial extensional flows. Capsule behavior in all cases was bounded by the response of capsules to uniaxial, biaxial and planar extensional flows.


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    Albin O. Kuhn Library & Gallery
    University of Maryland, Baltimore County
    1000 Hilltop Circle
    Baltimore, MD 21250
    www.umbc.edu/scholarworks

    Contact information:
    Email: scholarworks-group@umbc.edu
    Phone: 410-455-3544


    If you wish to submit a copyright complaint or withdrawal request, please email mdsoar-help@umd.edu.